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Help CenterSteel Pipe Supplier – Seamless & Welded Carbon Steel & Alloy Steel – OD 5mm – 256mm For Oil & Gas, Power Generation, Construction, Hydraulic, Boiler
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Steel Pipe – Seamless & Welded
Carbon Steel & Alloy Steel – OD 5mm – 256mm
For Oil & Gas, Power Generation, Construction, Hydraulic, Boiler
Product Overview
Our steel pipe product range covers both seamless and welded (ERW) constructions in carbon steel and alloy steel materials. With outer diameters from 5mm to 256mm and wall thicknesses from 0.8mm to 25mm, we supply pipes for diverse industries including oil & gas, power generation, petrochemical, construction, hydraulic systems, and boiler manufacturing.
Key Features:
Wide size range – OD 5-256mm – one-stop sourcing
Seamless or welded – Choose based on application requirements
Multiple materials – Carbon steel & alloy steel (Cr-Mo)
Broad standard coverage – ASTM, ASME, API, EN, DIN, GB
Heat treated – Normalized, quenched & tempered, as-rolled
100% hydrostatic tested – Guaranteed integrity
Full traceability – EN 10204 Type 3.1 MTC with heat number
✅ Seamless construction – No weld seam – pressure integrity
✅ ERW welded construction – Cost-effective for general applications
✅ Alloy steel options – Chrome moly for high temperature service
✅ Carbon steel options – Economical general purpose
✅ Factory direct | Global shipping
Key Specifications
| Parameter | Details |
|---|---|
| OD Range | 5mm – 256mm (0.197″ – 10.079″) |
| WT Range | 0.8mm – 25mm |
| Length | 4m – 12m (fixed or random) |
| Manufacturing | Seamless (hot rolled/cold drawn) or Welded (ERW) |
| Material | Carbon Steel, Alloy Steel (Cr-Mo) |
| Surface Finish | Black / Bare / Oiled / Painted / Galvanized |
| End Finish | Plain / Beveled / Threaded |
Material & Standard Cross-Reference
| Material Type | Standard | Grades | Application |
|---|---|---|---|
| Carbon Steel | ASTM A106 | Gr.B, Gr.C | High temperature service |
| Carbon Steel | ASTM A53 | Gr.B | General pressure piping |
| Carbon Steel | API 5L | Gr.B, X42, X52, X60, X65, X70 | Oil & gas pipelines |
| Carbon Steel | EN 10216-2 | P235GH, P265GH, 16Mo3 | Pressure purposes (elevated temp) |
| Carbon Steel | GB/T 8163 | 10#, 20#, Q345 | Fluid transport |
| Carbon Steel | GB/T 5310 | 20G, 15CrMoG, 12Cr1MoVG | High pressure boiler |
| Carbon Steel | GB/T 3087 | 10#, 20# | Low & medium pressure boiler |
| Alloy Steel | ASTM A335 | P11, P22, P91 | High temperature alloy pipe |
| Alloy Steel | ASTM A213 | T11, T22, T91 | Alloy steel boiler tube |
| Low Temperature | ASTM A333 | Gr.1, Gr.3, Gr.6, Gr.8 | Low temperature service |
Steel Pipe Grade Selection Guide
| Application | Recommended Grade | Standard | Manufacturing |
|---|---|---|---|
| General fluid transport | 20#, A106 Gr.B | GB/T 8163, ASTM A106 | Seamless |
| High pressure boiler | 20G, A192 | GB/T 5310, ASTM A192 | Seamless |
| Superheater / reheater | T11, T22, T91 | ASTM A213 | Seamless |
| Oil & gas pipeline | X52, X65, X70 | API 5L | Seamless / ERW |
| High temperature alloy pipe | P11, P22, P91 | ASTM A335 | Seamless |
| Low temperature service | A333 Gr.6, Gr.8 | ASTM A333 | Seamless |
| Structural support | Q345, S355J2H | GB/T 8162, EN 10210 | Seamless / ERW |
| Hydraulic cylinder | E355, ST52 | EN 10305, DIN 2391 | Cold drawn seamless |
Chemical Composition (Typical – Carbon Steel)
| Grade | C | Si | Mn | P max | S max |
|---|---|---|---|---|---|
| 20# / A106 Gr.B | 0.17-0.23 | 0.17-0.37 | 0.35-0.65 | 0.035 | 0.035 |
| 20G | 0.17-0.24 | 0.17-0.37 | 0.35-0.65 | 0.030 | 0.030 |
Chemical Composition (Typical – Alloy Steel)
| Grade | C | Cr | Mo | Other |
|---|---|---|---|---|
| P22 (ASTM A335) | 0.05-0.15 | 1.90-2.60 | 0.87-1.13 | — |
| P91 (ASTM A335) | 0.08-0.12 | 8.00-9.50 | 0.85-1.05 | V 0.18-0.25 |
Mechanical Properties
| Grade | Tensile (MPa) | Yield (MPa) | Elongation (%) |
|---|---|---|---|
| 20# / A106 Gr.B | 410-550 | ≥245 | ≥20 |
| 20G | 410-550 | ≥245 | ≥24 |
| P22 | ≥415 | ≥205 | ≥30 |
| P91 | ≥585 | ≥415 | ≥20 |
| A333 Gr.6 | ≥415 | ≥240 | ≥30 |
| X65 (API 5L) | 531-758 | ≥448 | ≥22 |
Available Sizes – Steel Pipe
| OD (mm) | OD (inch) | WT Range (mm) | Typical Applications |
|---|---|---|---|
| 5 – 20 | 0.197″ – 0.787″ | 0.8 – 2.5 | Instrumentation, small bore |
| 20 – 50 | 0.787″ – 1.968″ | 1.5 – 5.0 | General fluid, hydraulic lines |
| 50 – 100 | 1.968″ – 3.937″ | 2.0 – 8.0 | Boiler tubes, gathering lines |
| 100 – 200 | 3.937″ – 7.874″ | 3.0 – 15.0 | Steam lines, transmission pipelines |
| 200 – 256 | 7.874″ – 10.079″ | 4.0 – 25.0 | Large diameter pipelines, headers |
💡 Most popular sizes: 60.3mm (2″), 76mm (3″), 88.9mm (3.5″), 114.3mm (4.5″), 168.3mm (6.6″), 219.1mm (8.6″) OD
Applications by Industry
| Industry | Application | Recommended Grade |
|---|---|---|
| Oil & Gas | Gathering, transmission, distribution lines | API 5L X42-X70 |
| Power Generation | Boiler tubes, superheaters, steam lines | A106 Gr.B, A192, A213 T91 |
| Petrochemical | Process piping, heat exchangers, furnaces | A106 Gr.B, A335 P11/P22 |
| Construction | Structural frames, scaffolding, piles | Q345, S355J2H |
| Hydraulic Systems | Cylinder barrels, hydraulic lines | ST52, E355 |
| Shipbuilding | Hull structures, marine piping | ABS Grade, API 5L |
| Water Treatment | Water supply, sewage lines | A53 Gr.B, 20# |
| Low Temperature | LNG, refrigeration, cold climate | A333 Gr.6, Gr.8 |
| Automotive | Shock absorber tubes, steering components | ST52, E355 |
| General Engineering | Machinery parts, supports, frames | 20#, Q235B |
Quality Assurance & Testing
| Test | Method | Coverage | Applicable Standards |
|---|---|---|---|
| Hydrostatic Test | Water pressure | 100% | All standards |
| Ultrasonic Testing (UT) | Non-destructive | By agreement | ASTM E213 |
| Eddy Current (ET) | Non-destructive | By agreement | ASTM E309 |
| Tensile Test | EN ISO 6892-1 | Per lot | All standards |
| Charpy Impact Test | EN ISO 148-1 | Per lot | Low temp & alloy grades |
| Hardness Test | Rockwell/Brinell | Per lot | All grades |
| Flattening Test | Ductility | Per lot | Boiler tubes |
| Flaring Test | Tube end expansion | Per lot | Heat exchanger tubes |
| Dimensional Inspection | Micrometer | 100% | All standards |
| Visual Examination | Direct | 100% | All standards |
Mill Test Certificate
EN 10204 Type 3.1 MTC – Standard
EN 10204 Type 3.2 – Available upon request (third-party: SGS, BV, TUV, DNV)
Traceability: Full traceability from melt to finished pipe
Heat treatment records – Normalizing, quenching & tempering temperatures
NDT reports – UT/ECT results (if specified)
Processing Services
| Service | Description | Applicable Pipe Types |
|---|---|---|
| Cutting | Precision cutting to exact length (±1mm) | All |
| Beveling | For welding preparation (30°-37.5°) | All |
| Threading | NPT, BSP, or custom threads | NPS ≤4″ |
| Bending | Cold or hot bending | Carbon steel |
| Surface coating | Oiling, painting, galvanized, 3LPE, FBE | All |
| Heat treatment | Normalizing, annealing, stress relieving | All |
| Honing | Internal surface finish for hydraulic cylinders | Hydraulic grades |
Packaging & Shipping
| Item | Details |
|---|---|
| Packaging | Hexagonal bundles (small OD) or steel crates (large OD) |
| Protection | Anti-rust oil + plastic end caps |
| Marking | Stencil/spray with Grade, size, heat number, standard |
| Documentation | MTC + test reports |
| Lead time | 7-15 days (stock sizes), 20-30 days (custom) |
| Port | Tianjin / Shanghai / Guangzhou |
Why Choose Our Steel Pipe?
| Advantage | Description |
|---|---|
| Wide product range | OD 5-256mm – one-stop sourcing |
| Seamless & welded options | Both available |
| Multiple standards | ASTM, ASME, API, EN, DIN, GB |
| Full material traceability | EN 10204 3.1 MTC with heat number |
| 100% hydrostatic tested | Guaranteed pressure integrity |
| Heat treated | Normalized or quenched & tempered |
| In-house processing | Cutting, beveling, threading, coating |
| Competitive pricing | Factory direct – no middlemen |
| Global export | Shipped to over 30 countries |
Contact for Quote
Please provide the following details:
Material : Carbon Steel / Alloy Steel
Standard : ASTM / API / EN / GB / Other _______
Grade : _______
Manufacturing : Seamless / Welded (ERW)
OD (mm) : _______
WT (mm) : _______
Length (m) : _______
Quantity : _______ (pieces / meters / tons)
Application : _______
End Finish : Plain / Beveled / Threaded
Inspection : Standard / Third-party (SGS/BV/TUV/DNV)
📧 Email: yjhtrade@gmail.com
📞 WhatsApp: +86 15106174543
🌐 Website: /
Reply within 24 hours.
FAQ – Steel Pipe
Q1: What is the difference between seamless and welded steel pipe?
A: Seamless – no weld seam, higher pressure rating, higher cost. Welded (ERW) – has a longitudinal weld seam, lower cost, suitable for general applications.
Q2: What is the maximum size available?
A: 256mm OD standard. Larger sizes up to 610mm available upon request.
Q3: Which steel pipe is best for high temperature service?
A: ASTM A106 Gr.B/C for carbon steel, ASTM A335 P11/P22/P91 for alloy steel.
Q4: Which steel pipe is best for low temperature service?
A: ASTM A333 Gr.6 for -45°C service, Gr.8 (9% Nickel) for -195°C LNG service.
Q5: Which steel pipe is best for oil & gas pipelines?
A: API 5L X52, X65, X70 – PSL2 for sour service.
Q6: Is steel pipe weldable?
A: Yes – carbon steel grades have excellent weldability. Alloy grades require preheat and PWHT.
Q7: Do you provide third-party inspection?
A: Yes. SGS, BV, TUV, DNV, or any customer-specified agency.
Q8: Do you offer free samples?
A: 30cm sample available for common sizes. Shipping fee applies.
Related Products
Seamless Steel Pipe – High pressure applications
ERW Steel Pipe – Cost-effective general purpose
Precision Steel Tube – Hydraulic cylinder applications
Alloy Steel Pipe – High temperature service (P11, P22, P91)
Low Temperature Pipe – Cryogenic service (A333 Gr.6, Gr.8)
Boiler Tube – High pressure boiler applications
Line Pipe – Oil & gas transmission
Tags: Steel Pipe Seamless Steel Pipe ERW Steel Pipe Carbon Steel Pipe Alloy Steel Pipe ASTM A106 API 5L GB/T 8163
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